Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units)) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 25, 2014	Oct. 26, 2013
RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	9	10
Grant date fair value per share	$ 23.10	$ 23.11
Expected dividend	3.00%	2.70%
Range of Risk Free Interest Rate, Minimum	0.00%	0.00%
Range of Risk Free Interest Rate, Maximum	1.80%	1.40%
PERFORMANCE RESTRICTED STOCK UNITS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in millions)	6	4
Grant date fair value per share	$ 23.31	$ 22.70
Expected dividend	3.00%	2.30%
Range of Risk Free Interest Rate, Minimum	0.00%	0.00%
Range of Risk Free Interest Rate, Maximum	1.80%	1.40%
Range of Expected Volatility Rate, Minimum	15.10%	17.40%
Range of Expected Volatility Rate, Maximum	70.00%	70.50%